Ultrasonic anemometer专利检索-风速计风力发电机组风能专利检索查询-专利查询网

Ultrasonic anemometer

阅读：152发布：2021-09-14

专利汇可以提供Ultrasonic anemometer专利检索，专利查询，专利分析的服务。并且An ultrasonic anemometer for detecting the direction and the magnitude of the wind by the use of two pairs of ultrasonic transmitters and receivers arranged in the wind in spaced-apart opposition to each other and in reverse sense directions to each other and each pair of received ultrasonic pulsive signals is converted to a pulse the duration of which is proportional to a time difference between respective incoming instants of said each pair of received ultrasonic pulsive signals. The setting of a multivibrator is carried out when the instantaneous level of the signal exceeds a predetermined threshold level and the resetting of the multivibrator is carried out when the number of zerocrossing instants of the signal reaches a predetermined number so that the incoming instant is detected at the resetting of the multivibrator for each of the received ultrasonic pulsive signals. The velocity of wind along the sense direction can be detected by discriminating the duration of the pulse converted.，下面是Ultrasonic anemometer专利的具体信息内容。

权利要求

1. An ultrasonic anemometer, comprising: a first electro-ultrasonic transducer and a first ultrasonicelectric transducer arranged oppositely to each other at a predetermined sense direction; a second electro-ultrasonic transducer and a second ultrasonicelectric transducer arranged oppositely to each other at said predetermined space in the reverse direction to said sense direction of said first pair; means for simultaneously generating a train of successive ultrasonic pulses having a predetermined period from said first and second electro-ultrasonic transducers; a first signal receiving means connected to the output of said first ultrasonic-electric transducer to receive incoming ac signals corresponding to the ultrasonic pulses and comprising a zero-crossing detector for detecting zero-crossing instants of the ac received signals and for producing zero-crossing pulses in response to The zero-crossing instants, a multivibrator set by the first pulse of the zero-crossing pulses for each of the received ac signals and reset in synchronism with one of the zero-crossing pulses which coincides with a predetermined order number of cycles of each of the received ac signals, and a detector for detecting the resetting instant of the multivibrator as the incoming instant of each of the received ac signals; a second signal receiving means connected to the output of said second ultrasonic-electric transducer to receive incoming ac signals corresponding to the ultrasonic pulses and comprising a zero-crossing detector, multivibrator and detector alike those in said first signal receiving means;, a signal converter connected to said first signal receiving means and said second signal receiving means to obtain a pulse train the duration of each pulse of which is proportional to the time difference between said incoming instants respectively detected by said detector of said first signal receiving means and said second signal receiving means; and a pulse duration discriminator connected to said signal converter and comprising a saw-tooth wave generator for producing in response to each pulse of the pulse train a sawtooth wave which has a substantially constant slope and the duration of which coincides substantially with the duration of said pulse of the pulse train, a first capacitor for temporarily charging to the voltage of the saw-tooth wave after the termination of the saw-tooth wave, a bidirectional gate having two input terminals to one of which the charged voltage is applied, a generator for generating gating pulses each of which is timed with the termination of the saw-tooth wave and applied to the bidirectional gate, and a second capacitor connected to the other input terminal of said bidirectional gate to receive the charged voltage of said first capacitor so as to produce a discriminated output signal indicative of the velocity of the wind along said sense direction.

2. An ultrasonic anemometer according to claim 1, in which each of said first and second signal receiving means includes a clipper for clipping the received ac signal by the use of a pair of clipping levels exceeding the peak level of incoming noise, and a filter for passing therethrough to its respective zero-crossing detector the received ac signal and for checking components higher than the frequency of the received signal.

3. An ultrasonic anemometer according to claim 1, in which each said first and second signal receiving means includes means for stopping application of the zero-crossing pulses to its respective multivibrator during a time interval which immediately precedes the received ac signal.

4. An ultrasonic anemometer according to claim 1, further including discharge means comprising a transistor having an emitter, collector and base and a delay circuit having a delay time equal to the predetermined duration, and wherein the path from the emitter and collector of said transistor is connected across said first capacitor and the output of said delay circuit is applied to the base of said transistor.

5. An ultrasonic anemometer according to claim 1, in which said bidirectional gate is composed of two NPN transistors each having an emitter, collector and base, and wherein the emitter and bases of said two transistors are respectively connected commonly to each other to form a pair of terminals for receiving the gating pulses and the collectors of said two transistors comprise inputs of bidirectional gate.

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Ultrasonic anemometer

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